IUD. Because it is inexpensive in comparison to consistently paying for the pill or condoms, and can last for a long time depending on the type, and has a 99% success rate.
The first one is true and the second one is false because anything above it that gets hit it's considered a fault. The first one is true because because it is not on the out side of it.
Regular exercises are the best way to prevent flexibility issues because it helps keep muscles healthy and in good shape. For that reason, it is not as probable for muscles to get torn down and for people to experiences with flexibility if they work out regularly.